Insulator



March 27, 1928.

G. l. GILCHREST INSULATOR Filed Sept. 16,. 1922 R re si INVENTO George LGlch w|TNEssEs; ZR?. cg.

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Patented Mar. 27, 1928; i

UNITEDl STATES PATENT OFFICE.

GEORGE IRVING GILCHREST, OF DERBY,

VANIA.

PENNSYLVANIA, ASSIGNOR TO 'WESTING- i HOUSE ELECTRIC & MANUFACTURING COMPANY, A'CORPORATION OF PENNSYL- INSULATOR.

Application led September 16, 1922. Serial No. 588,525.

My invention relates t6 insulators and particularly to suspension1 insulators adapted for high-potentialcircuits. f

One object of my invention is to provide 5 a device of the above-indicated character that shall materially increase the voltage values thaty it is adapted to support over those of an insulator of a similar type heretofore employed.

Another object of my invention is to provide a high-potential suspension insulator of such construction and that shall be so provided with a novel tension or terminal mem-v ber as to greatly improve the insulating characteristics thereof."

A further object of my invention is to provide a high potential suspension insulator that shall be simple and durable in construction, economical in manufacture and effective in its operation. y

Copending application Serial No. 589,088, filed Sept. 19, 1922, by F. H. Miller and assigned to the Westinghouse Electric & Manufacturing Company setsforth the development of high-potential insulators up to an insulator similar to that for which my invention is adapted.

. Heretofore, while it has been customary to employ insulating materials such as wood for the pins of insulators of the rigid 'crossarm type, insulating material has not, to the best of my knowledge, ever been employed in the pins to alone sustain the load in suspension insulators of the type to which myv invention appertains, prior to the suggestion set forth in the above-entitled copending application.

With the advent of suspension insulators of the cap-and-pin type having a much 4 longer body than hereto ore employed or, in

other words, a much greater distance between the cap and the farthermost end of the pin, the idea of constructing the pin or tension member of insulating material was conceived. This construction greatly reduces the amount of metal in the insulator and, as

a result, materially increases its insulating prierties. n U

y inventlon, which is suggested as an improvement over the insulator of the aboveentitled copending application, comprises a novel tension member or pin which is so constructed of telescoped or superimposed tubes o f different insulating materials as to provlde a rigid structure that is revented vfrom deterioration by moisture antfcharring.

The smgle figure of the accompanying drawing is a side view, partially in side elevation'and partially in longitudinal section, of an insulator embodying my invention. The device comprises in general a main insullatmg body member 2, preferabl of porcelaln, a tension member 3, meta terminal members 4 and 5 and an anchor member 6 lfor )the inner member of the tension mem- The main insulatin body member 2, preferably constructed o? refractory insulating material such as porcelain or glass, is of subsltantially tubular form having a closed end portion 8 of substantially cup shape, intermediate petticoat or surface-creepage portions 9 and an end skirty 10. The terminal member 4 having an eye or clevis thereon is of substantially cup shape closely conforming to the end portion 8 of the insulating member 2 andl is preferably cemented to the portion 8 in accordance with established practice.

The tension structure 3, of which -the anchor member 6 and the terminal member 5 constitute parts, further comprises a tubular member 11, preferably of fibrous insulating material impregnated with a binder, that is rigidly secured to the adjacent ends 12 and 13 of the members 5 and 6, respectively, as by threading, over which a tube 15 of refractory insulatlng material, such as rcelain or glass, is secured. While norma y the insulating tube 11 may be adaptedto sustain the entire mechanical load, it may be reinforced by a member 14 of wood or other suitable material which also constitutes a filler for the tube 11.

In the abovedescribed construction of the tension member 3 suilcient mechanical strength is provided, charrin from corona and deterioration by latmosp ericmoisture are prevented and, by the elimination of metal, the operatng'characteristics of the insulator are greatly improved.

While I have shown and described apparticular form ot my im!entiontIl various modications and cbangesma be made tberein vritbout departing trom te spirit and scope oit' tbe invention, as set tortli in tbe appended claims.

il claim as my invention:

l., ln combination, in an insulator, a member ot refractory insulatin material baving a portion ot substantie y cup-shape, a pin structure embodying an elongated nbrous insulating tube and metal end members, one ot vvbicli is secured in position in tbe cup and a body ot refractory material enclosing said tube.

2., ln combination, in an insulator", a member of refractory insulating material baving a portion ot substantially cup-shape, a pin structure embodying an elongated fibrous insulating tube, metal end members :tor said tube and an insulating tiller material in tbe tube9 one oit said metal end members being secured in position in tbe cup and a body oi` refractory material enclosing said tube.

3.. in combination, in an insulator, a member ot refractory insulating material having a portion of substantially cup-shape., a pin structure embodying an elongated insulating tube, metal end members tor said tube and a protective covering on said tube, one oi said metal end members being disposed in tbe cup removed trom the side Walls tbereol, and a body ot cement in tbe space between tbe cup and tbe end member in tbey ling tube and metal end members ior inet-noe cup securing tbe pin to said refractory member.

1l. ln combination, in an insulator, member oi refractory insulating material baving a portion oil substantially cup-sleape9 a pin structure embodying an elongated insulating tube? metal end members for said tube and a refractory tube enclosing said tube., one of said metal end members being secured in position in the cup.

o'. lin combination7 in an insulator9 a member ot refractory insulating material baving a portion ot substantially cup-shape, a pin structure embodying an elongated insulal sai tube, an insulating nller material in tbe tube and a refractory tube enclosing said tube, one of said metal members being secured in position in tbe cup.

ti. lin combination, in a high-voltage suspension insulator, a member oit refractory insulating material having a portion oi substantially cup-shape, a tension pin structure embodying an elongated tibrous loadsupporting tube, metal end members for said tube, an insulating iiller material in the tube and a refractory. tube enclosing said tube, one ot said metal end members being secured in position in the cup. p

ln testimony whereof, ll have hereunto subscribed my name this 6th day of September, 1922.

GERGE IRVING GilLCl'rlRES'l.l 

